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Extending density matrix embedding: A static two-particle theory
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DOI：10.1103/PhysRevB.104.245114.png)
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Abstract
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We introduce extended density matrix embedding theory (EDMET), a static quantum embedding theory explicitly self-consistent with respect to local two-body physics. This overcomes the biggest practical and conceptual limitation of more traditional one-body embedding methods, namely the lack of screening and treatment of longer-range interactions. This algebraic zero-temperature embedding augments a local interacting cluster model with a minimal number of bosons from a description of the full system correlations via the random phase approximation, and admits an analytic approach to build a self-consistent Coulomb-exchange-correlation kernel. For extended Hubbard models with nonlocal interactions, this leads to the accurate description of phase transitions, static quantities, and dynamics. We also move towards ab initio systems via the Parriser-Parr-Pople model of conjugated coronene derivatives, finding good agreement with experimental optical gaps.
Keywords:
RANDOM-PHASE-APPROXIMATION
ELECTRON-GAS
PARAMETERS
ENERGIES
ORDER
MODEL
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